ARM: dts: rockchip: remove #phy-cells from usbphy node rk3066/rk3188

The review process of rockchip-usb-phy.yaml was not finished
when the patch in the link below was already applied.
Remove the unneeded #phy-cells property.

https://lore.kernel.org/r/20210512122346.9463-4-jbx6244@gmail.com

Fixes: 6e4e4e2a ("ARM: dts: rockchip: move and restyle grf nodes rk3066/rk3188")
Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Link: https://lore.kernel.org/r/20210603121010.4315-1-jbx6244@gmail.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm/boot/dts/rk3066a.dtsi

@@ -684,7 +684,6 @@ &grf {
 	usbphy: usbphy {
 		compatible = "rockchip,rk3066a-usb-phy",
 			     "rockchip,rk3288-usb-phy";
-		#phy-cells = <0>;
 		#address-cells = <1>;
 		#size-cells = <0>;
 		status = "disabled";

arch/arm/boot/dts/rk3188.dtsi

@@ -644,7 +644,6 @@ &grf{
 	usbphy: usbphy {
 		compatible = "rockchip,rk3188-usb-phy",
 			     "rockchip,rk3288-usb-phy";
-		#phy-cells = <0>;
 		#address-cells = <1>;
 		#size-cells = <0>;
 		status = "disabled";